CN206353201U - A kind of meter calibration circuit for calibrating automatically - Google Patents
A kind of meter calibration circuit for calibrating automatically Download PDFInfo
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- CN206353201U CN206353201U CN201621294698.3U CN201621294698U CN206353201U CN 206353201 U CN206353201 U CN 206353201U CN 201621294698 U CN201621294698 U CN 201621294698U CN 206353201 U CN206353201 U CN 206353201U
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Abstract
The utility model discloses a kind of meter calibration circuit for calibrating automatically, the circuit mainly includes electric signal, metering module, calibration equipment；The electric signal is ammeter current signal and voltage signal to be measured；The metering module is provided with sensor, filter circuit, computation chip, data communication interface；The calibration equipment is used to provide basic parameter for metering module；The electric signal inputs to metering module, and the digital data transmission of calibration is given calibration equipment by metering module, and basic parameter is then write the computation chip to metering module by calibration equipment.The meter calibration circuit is calibrated by special chip to ammeter, and directly the chip calibrated is welded on pcb board and be can be used, error rate reaches Standard, is that production firm simplifies cumbersome calibration steps.Realize that device simple, cost are low simultaneously, calibration efficiency is high, error is small.
Description
Technical field
The utility model belongs to the calibration circuit of ammeter technical field, more particularly to ammeter.
Background technology
Metering ammeter or the product of similar electric energy metrical function in the market is because of different components, PCB
Difference, gone here and there when electric signal is reached chip detection pin through oversampling circuit into noise, cause measurement result to produce larger error, and
Error rate exceeds Standard, so entering again after chip must being all soldered to before ammeter class product export on the market on pcb board
Row complete machine is calibrated, to ensure that its error rate reaches Standard；This relatively time consuming effort for production firm, manufacturer will buy
Corresponding calibration signal equipment, asks special messenger to spend a lot of time and complete machine is calibrated, cost is higher.
Problem above is due to generate error after die terminals plus signal is calibrated, then when being soldered to pcb board.Such as：
5mV is provided for chip, 200mV calibration signal, after being calibrated, chip is soldered on pcb board again, because circuit and component are produced
Having given birth to noise makes 200VAC, 5A, 1000W load be connected to after circuit, and the signal for reaching die terminals generates deviation, then it is no longer
It is 5mV, therefore 200mV, error produces, and according to the size of noise, deviation can reach more than 5%.
As patent application 201310297731.2 discloses a kind of meter calibration method and automated calibration system, methods described
Including：Control correction platform adds default voltage x current, under stable voltage x current, treat the self-inspection of school ammeter；It is automatic to read
Take and the voltage x current value of master meter and treat the voltage x current value of school ammeter, and contrast conting voltage x current deviation, when not existing
When in accuracy rating, according to voltage x current deviation to treating that school ammeter sends order adjustment ammeter penalty coefficient；According to default
Test point control correction platform adds corresponding default current loading angle, obtains master meter current power, school is treated while reading
The power of ammeter is compared, and calculates power offset value, when not in accuracy rating, is sent penalty coefficient adjustment and is treated school electricity
Table.
However, this method is the detection and calibration to ammeter by correction platform realization, batch processing executive mode is realized, is made
Whole trimming process full automation, but calibration device structure is complicated, rate-determining steps complexity, and calibration is inefficient, has
Treat in further improvement.
The content of the invention
Based on this, therefore primary mesh of the present utility model be to provide a kind of meter calibration circuit for calibrating automatically,
The meter calibration circuit is calibrated by special chip to ammeter, and directly the chip calibrated is welded on pcb board i.e.
It can be used, error rate reaches Standard, be that production firm simplifies cumbersome calibration steps.
Another purpose of the present utility model is to provide a kind of meter calibration circuit for calibrating automatically, the meter calibration
Circuit realiration device simple, cost are low, and calibration efficiency is high, error is small.
To achieve the above object, the technical solution of the utility model is：
A kind of meter calibration circuit for calibrating automatically, it is characterised in that the circuit mainly includes electric signal, metering mould
Block, calibration equipment；
The electric signal is ammeter current signal and voltage signal to be measured；
The metering module is provided with sensor, filter circuit, computation chip, data communication interface；
The calibration equipment is used to provide basic parameter for metering module；
The electric signal inputs to metering module, and the digital data transmission of calibration is given calibration equipment, calibration by metering module
Basic parameter is then write the computation chip to metering module by equipment.
Further, the metering module, its sensor receives electric signal input, and sensor is connected with filter circuit, to go
Except interference and noise, the filter circuit is filtered after processing, input a signal into computation chip, computation chip is calibrated
Afterwards, data signal is transferred to calibration equipment by data communication interface.
The computation chip, it mainly includes signal processing module, electric signal basic parameter memory module, monitoring module；
Signal sampling, signal operation, abnormal signal prompting processing are carried out in the signal processing module to electric signal；
The electric signal basic parameter memory module is used to store the basic parameter that calibration equipment is transmitted, it is allowed to repeatedly
Update basic parameter；
The monitoring module is monitored to signal processing module and electric signal basic parameter memory module, monitors electric signal
Whether basic parameter memory module data are tampered, and whether monitoring signal processing module PC pointers malfunction, computation chip sram is
Whether no error or clock go wrong.
Compared with prior art, the beneficial effects of the utility model are：Electric signal can be any telecommunications in the utility model
Number；The contrast whole scheme of prior art the utility model only needs electric signal, metering module, calibration equipment, has been greatly saved resource.
Computation chip allows repeatedly to obtain the basic parameter in calibration equipment, i.e., interior charged signal basic parameter memory module, can be multiple
Calibration.
Brief description of the drawings
Fig. 1 is that the utility model is implemented to calibrate the structural representation of circuit.
Fig. 2 is the structured flowchart that the utility model implements computation chip.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only to explain
The utility model, is not used to limit the utility model.
Fig. 1 show the utility model ammeter auto-calibration circuits structural representation, and the circuit mainly includes electric signal, meter
Module, calibration equipment are measured, details are as follows：
When ammeter as shown in Figure 1 is calibrated automatically, electric signal is set first, and by the electric current, voltage, work(of electric signal
Rate etc. is defaulted in calibration equipment, in the automatic calibration of batch, need to only be configured when using first.
Electric signal is connected in the sensor of metering module, and filtered circuit carries out equal proportion shunting, partial pressure to electric signal
And after filtering, signal reaches computation chip.
Computation chip produces the analog signal of electric current, voltage, power etc., and analog signal is sampled, filtered and transported
Calculation processing (the concussion frequency as handled analog signal).So as to draw the data signals such as electric current, voltage, power.
Data signal by the agreement provided through communication interface, is transferred on tester, tester by computation chip
Data signal and preset value (electric current, voltage, power in such as Fig. 1) are carried out computing by internal MCU, while after filtering, obtaining
Basic parameter.
Tester is drawn after basic parameter, and by the agreement provided by communication interface, basic parameter is write back into meter
The electric signal memory module of chip is measured, calibration is completed.
The shown the utility model of Fig. 2 can be used for the computation chip internal structure block diagram calibrated automatically, main to include letter
Number processing module, electric signal basic parameter memory module, monitoring module, details are as follows：
The analog signals such as electric current, voltage, the power produced in computation chip signal processing module to computation chip are believed
Number sampling, the detection processing of signal operation (such as current value=current signal frequency * current references parameter), abnormal signal.Only need
Computation chip is communicated according to computation chip communications protocol, you can obtain the data of associated electrical signals, it is big without doing
Amount sampling, computing, detecting can draw desired effective current value, effective voltage value, active power value etc..
Electric signal basic parameter memory module is used to store the basic parameter that calibration equipment is transmitted, and basic parameter is by believing
Number processing module controls the specific address that it is stored in electric signal basic parameter memory module；Electric signal basic parameter memory module
Multigroup basic parameter can be stored.
Monitoring module can be used for detection electric signal basic parameter memory module, when extraneous factor deposits electric signal basic parameter
When storage module data is tampered, monitoring module can be detected in time；If the basic parameter that computation chip is received is wrong, mould is monitored
Block can also be detected in time, it is to avoid when basic parameter is abnormal, still cause to draw improper value for computing, so as to ensure that number
According to accuracy and the security that uses；Another purposes of monitoring module is the accurate execution for ensureing signal processing module, when outer
When boundary's factor makes signal processing module PC pointers malfunction, computation chip sram malfunctions or frequency deviation occurs in clock frequency, it can answer again
Position program or data, so as to ensure that the stability used and more preferable Consumer's Experience.This accuracy, safety for product
Property and perfect Consumer's Experience have greatly improved.
Why computation chip is for for the computation chip calibrated automatically, its most basic reason is that computation chip is built-in
Electric signal memory module so that basic parameter has the region preserved.
Electric signal can be any electric signal in the utility model；The contrast whole scheme of prior art the utility model only needs electricity
Signal, metering module, calibration equipment, have been greatly saved resource.Computation chip allows the benchmark repeatedly obtained in calibration equipment to join
Number, i.e., interior charged signal basic parameter memory module, can repeatedly be calibrated.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Any modifications, equivalent substitutions and improvements made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (3)
1. a kind of meter calibration circuit for calibrating automatically, it is characterised in that the circuit mainly include electric signal, metering module,
Calibration equipment；
The electric signal is ammeter current signal and voltage signal to be measured；
The metering module is provided with sensor, filter circuit, computation chip, data communication interface；
The calibration equipment is used to provide basic parameter for metering module；
The electric signal inputs to metering module, and the digital data transmission of calibration is given calibration equipment, calibration equipment by metering module
Basic parameter is then write into the computation chip to metering module.
2. the meter calibration circuit as claimed in claim 1 for being used to calibrate automatically, it is characterised in that the metering module, its
Sensor receives electric signal input, and sensor is connected with filter circuit, and to remove interference and noise, the filter circuit is filtered
After ripple processing, input a signal into computation chip, after computation chip is calibrated, data signal is passed by data communication interface
It is defeated by calibration equipment.
3. the meter calibration circuit as claimed in claim 2 for being used to calibrate automatically, it is characterised in that the computation chip includes
There are signal processing module, electric signal basic parameter memory module, monitoring module；
Signal sampling, signal operation, abnormal signal prompting processing are carried out in the signal processing module to electric signal；
The electric signal basic parameter memory module is used to store the basic parameter that calibration equipment is transmitted, it is allowed to repeatedly update
Basic parameter；
The monitoring module is monitored to signal processing module and electric signal basic parameter memory module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621294698.3U CN206353201U (en) | 2016-11-30 | 2016-11-30 | A kind of meter calibration circuit for calibrating automatically |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621294698.3U CN206353201U (en) | 2016-11-30 | 2016-11-30 | A kind of meter calibration circuit for calibrating automatically |
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| Publication Number | Publication Date |
|---|---|
| CN206353201U true CN206353201U (en) | 2017-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621294698.3U Active CN206353201U (en) | 2016-11-30 | 2016-11-30 | A kind of meter calibration circuit for calibrating automatically |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646331A (en) * | 2016-11-30 | 2017-05-10 | 芯海科技（深圳）股份有限公司 | Electricity meter metering chip, circuit and calibration method used for automatic calibration |
-
2016
- 2016-11-30 CN CN201621294698.3U patent/CN206353201U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646331A (en) * | 2016-11-30 | 2017-05-10 | 芯海科技（深圳）股份有限公司 | Electricity meter metering chip, circuit and calibration method used for automatic calibration |
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